I will be a long time forgetting this movie

I rented this movie on my Kindle because I like Jean Dujardin and would like to watch all his films.

I was expecting a police procedural where the bad guy turns out to be a good guy, justice triumps and all is well with the world. This is not that movie.

The twist at the end grabbed me and the movie has been popping up occasionally to nudge me. I really didn't see it coming until it got there.

All in all, quite chilling, right down to the last line.